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Relative Risk Measure

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Questions and Answers

Which of the following statements is true about a relative risk less than 1?

The event is more likely to occur if there was exposure.

The event is less likely to occur if there was exposure. (correct)

The relative risk is not relevant in this scenario.

The event probability does not change with exposure.

In a clinical trial, if the relative risk is calculated to be 0.5, how does this impact the likelihood of the event occurring with exposure?

The event will definitely happen regardless of exposure.

The event is half as likely to happen with exposure. (correct)

The event is equally likely to happen with or without exposure.

The event is twice as likely to happen with exposure.

What can be inferred if the relative risk in a study is 0.8?

Exposure increases the likelihood of the event.

The study results are inconclusive.

Exposure reduces the likelihood of the event. (correct)

There is no association between exposure and the event.

If a relative risk value is 1.2, what does this suggest about the occurrence of the event with exposure?

<p>Exposure increases the likelihood of the event.</p> Signup and view all the answers

What does a relative risk equal to 1 indicate about the occurrence of an event with exposure?

<p>Exposure has no effect on the event.</p> Signup and view all the answers

Study Notes

Measuring Effect of Exposure

A measure of effect looks at the proportion of patients spared from an adverse outcome in absolute terms.
This measure is different from relative risk, which compares the risks in two groups.

Relative Risk (RR)

Relative risk is the ratio of risks in two groups, calculated in cohort studies and clinical trials.
RR can be interpreted in the following ways:
- If RR = 1, exposure is not associated with the disease.
- If RR > 1, exposure is positively associated with the disease, indicating increased risk.
- If RR < 1, the event is less likely to occur if there was exposure, indicating decreased risk.

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Description

Learn about the relative risk measure which compares risks in two groups by taking their ratio. This measure uses absolute terms to examine the proportion of patients who are spared from adverse outcomes.